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Introduce pthread_condattr_setclock()

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This is one of the few POSIX APIs that was missing. It lets you choose a
monotonic clock for your condition variables. This might improve perf on
some platforms. It might also grant more flexibility with NTP configs. I
know Qt is one project that believes it needs this. To introduce this, I
needed to change some the *NSYNC APIs, to support passing a clock param.
There's also new benchmarks, demonstrating Cosmopolitan's supremacy over
many libc implementations when it comes to mutex performance. Cygwin has
an alarmingly bad pthread_mutex_t implementation. It is so bad that they
would have been significantly better off if they'd used naive spinlocks.
This commit is contained in:
Justine Tunney 2024-09-02 23:37:50 -07:00
parent 79516bf08e
commit 3c61a541bd
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GPG key ID: BE714B4575D6E328
55 changed files with 449 additions and 155 deletions
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7
test/libc/thread/nsync_test.c
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@ -17,6 +17,7 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/errno.h"
#include "libc/sysv/consts/clock.h"
#include "libc/testlib/testlib.h"
#include "libc/thread/thread.h"
#include "third_party/nsync/cv.h"
@ -34,7 +35,8 @@ int Put(long v, nsync_time abs_deadline) {
int err, added = 0, wake = 0;
nsync_mu_lock(&mu);
while (count == limit) {
if ((err = nsync_cv_wait_with_deadline(&non_full, &mu, abs_deadline, 0))) {
if ((err = nsync_cv_wait_with_deadline(&non_full, &mu, CLOCK_REALTIME,
abs_deadline, 0))) {
ASSERT_EQ(ETIMEDOUT, err);
ASSERT_NE(0, nsync_time_cmp(nsync_time_no_deadline, abs_deadline));
}
@ -59,7 +61,8 @@ long Get(nsync_time abs_deadline) {
long err, v = 0;
nsync_mu_lock(&mu);
while (!count) {
if ((err = nsync_cv_wait_with_deadline(&non_empty, &mu, abs_deadline, 0))) {
if ((err = nsync_cv_wait_with_deadline(&non_empty, &mu, CLOCK_REALTIME,
abs_deadline, 0))) {
ASSERT_EQ(ETIMEDOUT, err);
ASSERT_NE(0, nsync_time_cmp(nsync_time_no_deadline, abs_deadline));
}